However, those methods have problems in productivity and cost performance. Therefore, we chose precision blanking used in various manufacturing methods with excellent productivity and cost performance. Specifically, we evaluated micro-gear shapes with complex shapes and micro-sizes using precision blanking whether or not it can keep the same accuracy as other methods. More specifically, to prevent fracture which is one of the difficult problems in precision blanking process, we have elucidated the fracture suppression mechanism [5].